For skin : 

Pepper mint oil have anti-inflammatory and healing properties, it soothes, you can use this oil if you have sunburn.  You can use like remover too.

To use : Take a few drops of pepper mint oil and massage the area.

For hair :

It hydrates the scalp and allows to activate the blood microcirculation. It allows to fight against hair loss, promote de hair growth, relieve itching and dandruff.

To use: Take a few drops of pepper mint oil and massage the scalp.

In capillary friction it acts on oily hair.

For headaches :

To use: Take a few drops of pepper mint oil and massage the temples and forehead.

For muscle relaxation :

To use: Take a few drops of pepper mint oil and massage the area to relieve muscle and joint pain.